diff --git a/test-tool/iscsi-support.h b/test-tool/iscsi-support.h
index df7fb11..df4c65a 100644
--- a/test-tool/iscsi-support.h
+++ b/test-tool/iscsi-support.h
@@ -198,13 +198,13 @@ extern int sbc3_support;
 extern int maximum_transfer_length;
 
 struct scsi_device {
-	const char *error_str;
+	char *error_str;
 
 	struct iscsi_context *iscsi_ctx;
 	int iscsi_lun;
-	const char *iscsi_url;
+	char *iscsi_url;
 
-	const char *sgio_dev;
+	char *sgio_dev;
 	int sgio_fd;
 };
 extern struct scsi_device *sd;
diff --git a/test-tool/iscsi-test-cu.c b/test-tool/iscsi-test-cu.c
index cb34f78..adc05e3 100644
--- a/test-tool/iscsi-test-cu.c
+++ b/test-tool/iscsi-test-cu.c
@@ -991,11 +991,11 @@ static int connect_scsi_device(struct scsi_device *sdev, const char *initiatorna
 static void free_scsi_device(struct scsi_device *sdev)
 {
 	if (sdev->error_str) {
-		free(discard_const(sdev->error_str));
+		free(sdev->error_str);
 		sdev->error_str = NULL;
 	}
 	if (sdev->iscsi_url) {
-		free(discard_const(sdev->iscsi_url));
+		free(sdev->iscsi_url);
 		sdev->iscsi_url = NULL;
 	}
 	if (sdev->iscsi_ctx) {
@@ -1005,7 +1005,7 @@ static void free_scsi_device(struct scsi_device *sdev)
 	}
 
 	if (sdev->sgio_dev) {
-		free(discard_const(sdev->sgio_dev));
+		free(sdev->sgio_dev);
 		sdev->sgio_dev = NULL;
 	}
 	if (sdev->sgio_fd != -1) {